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We report tunnel experiments on $\hbox{Bi}_{2}\hbox{Sr}_{2}\hbox{Ca}_{1-x}{\rm Y}_{x}\hbox{Cu}_{2}\hbox{O}_{8 + \delta}$ (Y-Bi2212) crystals with $x\! =\! 0, 0.01, 0.05,\ 0.1,\ 0.11,\ \hbox{and}\ 0.12$. The results are discussed about Cooper pairs existing. Tunneling spectra were measured for Y-Bi2212 crystal-SiO-Ag planar junctions. For superconducting samples the V-shaped gap structure and zero...
The purpose of our present study is to understand the Superconductor-Insulator Transition. In this paper we report tunnel experiments on Bi2Sr2Ca1−xYxCu2O8+δ (Y-Bi2212) crystals with x = 0, 0.01, 0.05, 0.1, 0.11 and 0.12. The results are discussed about Copper pairs existing. Tunneling spectra were measured for Y-Bi2212 crystal-SiO-Ag planar junctions. For superconducting samples the V-shape gap structure...
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